Method for removing polymer inside olefin oligomerization reactor

Abstract

Provided is a method for removing a polymer produced in an olefin oligomerization reactor. According to the method for removing a polymer of the present invention, since a polymer in a reactor may be removed within a short time, less time and cost are invested as compared with the case of disassembling the reactor and removing the polymer by manpower. In addition, downtime due to reactor maintenance decreases and productivity is improved.

1 . A method for removing a polymer in an olefin oligomerization reactor, the method comprising: performing an olefin oligomerization reaction using a chromium-based catalyst, and removing a polymer produced in a reactor in the olefin oligomerization reaction using a solvent. 
     
     
         2 . The method for removing a polymer in an olefin oligomerization reactor of  claim 1 , wherein the solvent is a C3 to C20 aliphatic hydrocarbon solvent or a C6 to C20 aromatic hydrocarbon solvent. 
     
     
         3 . The method for removing a polymer in an olefin oligomerization reactor of  claim 2 , wherein the solvent is selected from the group consisting of toluene, xylene, chlorobenzene, dichlorobenzene, dichloromethane, hexane, methylcyclohexane, and cyclohexane. 
     
     
         4 . The method for removing a polymer in an olefin oligomerization reactor of  claim 1 , wherein the method for removing a polymer in an olefin oligomerization reactor includes:
 (a) performing the olefin oligomerization reaction in a first reactor using the chromium-based catalyst;   (b) injecting the solvent into the first reactor which completes the olefin oligomerization reaction and heating the first reactor to produce a dissolution solution in which a polymer produced inside the first reactor is dissolved;   (c) precipitating the polymer from the dissolution solution in which the polymer produced inside the first reactor is dissolved; and   (d) separating and removing the precipitated polymer in a polymer removal device.   
     
     
         5 . The method for removing a polymer in an olefin oligomerization reactor of  claim 4 , wherein in (b), the solvent is heated to 60 to 150° C. 
     
     
         6 . The method for removing a polymer in an olefin oligomerization reactor of  claim 4 , wherein in (b), the producing of a dissolution solution in which a polymer produced inside the first reactor is dissolved is performed for 1 minute to 3 hours. 
     
     
         7 . The method for removing a polymer in an olefin oligomerization reactor of  claim 4 , wherein the polymer removal device is selected from the group consisting of centrifugation, compression filtration, gravity filtration, metal filter, ceramic membrane filter, sand filter, and adsorption devices. 
     
     
         8 . The method for removing a polymer in an olefin oligomerization reactor of  claim 4 , wherein the precipitating of the polymer in (c) is performed by a method of using a heat exchanger, a method of mixing solvents to cool the dissolution solution, or a method of treatment with a chemical. 
     
     
         9 . The method for removing a polymer in an olefin oligomerization reactor of  claim 4 , wherein the precipitating of the polymer in (c) is performed by mixing the product discharged after performing the olefin oligomerization reaction in the reactor other than the first reactor and the dissolution solution in which the polymer produced inside the first reactor is dissolved. 
     
     
         10 . The method for removing a polymer in an olefin oligomerization reactor of  claim 9 , wherein the first reactor and the reactor other than the first reactor are independently of each other selected from the group consisting of a batch reactor, a continuous stirred tank reactor, a tubular reactor, a loop reactor, a bubble column reactor, and a fluidized bed reactor. 
     
     
         11 . The method for removing a polymer in an olefin oligomerization reactor of  claim 9 , wherein a temperature of the product discharged after performing the olefin oligomerization reaction in the reactor other than the first reactor is 0 to 70° C. 
     
     
         12 . The method for removing a polymer in an olefin oligomerization reactor of  claim 9 , wherein a mixing volume ratio of the dissolution solution in which the polymer produced inside the first reactor is dissolved and the product discharged after performing the olefin oligomerization reaction in the reactor other than the first reactor is 1:0.01 to 1:100. 
     
     
         13 . The method for removing a polymer in an olefin oligomerization reactor of  claim 4 , further comprising: after (c), separating gas and liquid in a gas-liquid separator. 
     
     
         14 . The method for removing a polymer in an olefin oligomerization reactor of  claim 4 , further comprising: after (d), separating the oligomer in a distillation device. 
     
     
         15 . An olefin oligomerization reaction system in which the method for removing a polymer in an olefin oligomerization reactor of  claim 1  is performed.